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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>围棋效果</title>
</head>

<body>
    <div class="qp">
        <div class="wq">
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        </div>
    </div>
    <script>
        var wqqz = document.getElementsByClassName('wqqz');
        var flag = true;
        for (var i = 0; i < wqqz.length; i++) {
            wqqz[i].onclick = function () {
                if (flag) {
                    this.style.background = '#000';
                    flag = true;
                    flag = false;
                } else {
                    this.style.background = '#ccc';
                    flag = true;
                }
                //添加阴影
                this.style.boxShadow = '3px 3px 1px #666';
            }
        }
    </script>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .qp {
            width: 721px;
            height: 700px;
            margin: 25px auto;
            background: url('../img/8-09围棋棋盘.jpg') no-repeat 0/100% 100%;
            position: relative;
        }

        .wq {
            width: 700px;
            height: 700px;
            position: absolute;
            top: 18px;
            left: 18px;
        }

        .wqqz {
            width: 28px;
            height: 28px;
            margin: 4px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0);
            float: left;
        }
    </style>
</body>

</html>